AUTOMATIC TRANSMISSION

Ford Ranger

Hi. Mr

My question is: The automatic transmission of my pick up ranger (2000, V3.0 L) doesn´t change to the reverse. Few days ago it changed after I put in Drive first and then changed to the reverse gear. Now it only go forward and not in the reverse. The gear changed to the reverse, but the car did not move.

The fluid level is good. I did not change the fliter form the day I bought the car in the year 2000. Do you think that I should change the filter? Is that a easy task to do or have bring the car to a expert? Can you tell me how to change the filter?